How to use the Principled BSDF shader to create an old-paper-like material?
Here is what I got for you





For the color, I added a noise texture with a color ramp, the right side being a white-ish yellow, the centre-left being a darker yellow. On the very left, I had a dark orange, but this isn't that important. I then plugged the color ramp into the base color of the BSDF Shader.

If you want to add displacement, I used a Mix RGB node to mix a Noise Texture and a Musgrave Texture. I changed the fac of the Mix RGB so it is mostly the Musgrave Texture. When you connect the Mix RGB node to a displacement node, you will want to turn the strength down a lot. I changed the strength to about 0.05 in my example.

That should make a decent old paper texture using the Principled BSDF shader.

I hope I helped.